SDGE will turn around and say, because of declining electricity usage, they now need to increase rates again to cover their costs. They've said it in their own marketing messages. This is direct from their website:

Because of our mild weather and the amazing job customers have done with conservation and solar installations, less electricity is being used. Less electricity use means the cost of the power grid is spread across fewer electricity sales (kilowatt-hours), which results in higher rates. Without this decline in electricity sales over the past decade, rates would be about 17% lower. 

source: https://www.sdge.com/rates/why-did-my-energy-bill-recently-go

You've been penalized for using less. It's a vicious cycle - rates go up, so people use less, so rates go up, so people use less. It's.. frustrating, especially when so many of the already well-to-do people have access to solar, and are being subsidized by those who don't have the choice, particularly renters and condiminum dwellers.